Sorry Pro-ton but you are making up physics. The water pipe analogy is really only good for DC electricity and the better analogy is not a 12" pipe vs a 1" pipe but maybe 120' vs a 10' pipe. Does that make any difference at your theoretical sprinkler head? The answer, as if you didn't alredy guess, is no, not very much. Just look at how much power is delivered from Hoover Dam via 1" wire to Los Angeles. We're talkin' megawatts, baby.